import numpy as np
import pandas as pd

arr_2d = np.arange(1, 31).reshape((6, 5))  # 创建二维数组
df_obj = pd.DataFrame(data=arr_2d, columns=['No1', 'No2', 'No3', 'No4', 'No5'])

# print(arr_2d)
# print(df_obj)
result = df_obj.No2
# print(result)
# print(type(result))
print(df_obj.info())
